US4729845A
Expired / Lapsed
US
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Detergents for dishwashing machines in the form of fused blocks containing alkali hydroxides and active chlorine and a process for their production
Assignee: Henkel AG and Co KGaA
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Filing: 1986-05-29
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Granted: 1988-03-08
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Expires: 2006-05-29
Abstract
Abstract Detergents for dishwashing machines in the form of fused blocks containing alkali metal hydroxides, alkali metal silicates, and from 0.2 to 4% by weight of active chlorine donors having a hydrolysis constant of 3×10 -4 or lower (preferably Na- or K-dichloroisocyanurate, Na-dichloroisocyanurate dihydrate, Na-monochloroamido-sulfonate or Na-N-chloro-p-toluene sulfonic acid amide). The process of making the fused blocks comprises heating metasilicate or waterglass solution with or without solid alkali metal hydroxide to 45° to 48° C., allowing the reaction temperature to rise to 60° to 65° C., adding the remaining ingredients including the active chlorine donor at 50° to 65° C., pouring the still liquid melt into flexible molds and allowing it to solidify into blocks therein. The detergent blocks of the invention have good stability to storage and a high dissolving rate in use.
Inventors
- 👤 Theodor Altenschoepfer
- 👤 Jochen Jacobs
- 👤 Peter Jeschke
- 👤 Klaus Schumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:20
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/0047; C11D17/0052; C11D3/00; C11D3/02; C11D3/04; C11D3/08; C11D3/395; C11D3/3955
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
83 words
Storage stable detergent composition for dishwashing machines in the form of homogeneous fused blocks comprising from about 2 to about 70% by weight of alkali metal hydroxide, from about 2 to about 60% by weight of alkali metal silicate, from about 10 to about 40% by weight of water, and from about 0.2 to about 4% by weight of an active chlorine donor having a hydrolysis constant of about 3×10 -4 or below, all weights being based on the weight of said composition.
Claim 2
Dependent Claim
83 words
Storage stable detergent composition for dishwashing machines in the form of homogeneous fused blocks comprising from about 2 to about 70% by weight of alkali metal hydroxide, from about 2 to about 60% by weight of alkali metal silicate, from about 10 to about 40% by weight of water, and from about 0.2 to about 4% by weight of an active chlorine donor having a hydrolysis constant of about 3×10 -4 or below, all weights being based on the weight of said composition.
Claim 3
Dependent Claim
32 words
The detergent composition of claim 1, wherein the active chlorine donor is a member selected from the group consisting of sodium or potassium-dichloroisocyanurate, sodium dichloroisocyanurate dihydrate, sodium-N-mono-chloroamidosulfonate, and sodium-N-chloro-p-toluene sulfonic acid amide.
Claim 4
Dependent Claim
18 words
The detergent composition of claim 1 where the active chlorine content is from about 0.5 to about 2%.
Claim 5
Dependent Claim
20 words
The detergent composition of claim 1 which contains from about 2% to about 50% by weight of pentasodium triphosphate hexahydrate.
Claim 6
Dependent Claim
114 words
A storage stable detergent composition for dishwashing machines in the form of homogeneous fused blocks comprising on a weight basis of said composition: from about 5 to about 50% of sodium hydroxide; an alkali metal silicate selected from the group consisting of sodium metasilicate and waterglass solution wherein the amount of metasilicate is from about 2 to about 60% and the amount of waterglass is from about 2 to about 30%; from about 0.2 to about 4% of an active chlorine donor having a hydrolysis constant of about 3×10 -4 or below; from about 2 to about 50% on an anhydrous basis of pentasodium triphosphate, and from about 10 to about 40% of water.
Claim 7
Dependent Claim
114 words
A storage stable detergent composition for dishwashing machines in the form of homogeneous fused blocks comprising on a weight basis of said composition: from about 5 to about 50% of sodium hydroxide; an alkali metal silicate selected from the group consisting of sodium metasilicate and waterglass solution wherein the amount of metasilicate is from about 2 to about 60% and the amount of waterglass is from about 2 to about 30%; from about 0.2 to about 4% of an active chlorine donor having a hydrolysis constant of about 3×10 -4 or below; from about 2 to about 50% on an anhydrous basis of pentasodium triphosphate, and from about 10 to about 40% of water.
Claim 8
Dependent Claim
16 words
The composition of claim 5, wherein the active chlorine donor is sodium N-chloro-p-toluene sulfonic acid amide.
Claim 9
Dependent Claim
12 words
The composition of claim 5, wherein the active chlorine donor is Na-monochloroamidosulfonate.
Claim 10
Dependent Claim
138 words
A process for preparing homogeneous fused blocks of a storage-stable detergent composition comprised of, on a weight basis of said composition, from about 2 to about 70% by weight of sodium hydroxide, from about 2 to about 60% by weight of sodium silicate, from about 10 to about 40% by weight of water, from about 2 to about 50% by weight of pentasodium triphosphate, and from about 0.2 to about 4% by weight of an active chlorine donor having a hydrolysis constant of about 3×10 -4 or below, which comprises heating said sodium silicate with said sodium hydroxide to a temperature between about 45 and about 65° C., adding the remaining ingredients at a temperature of between about 50 and about 65° C., and while the reaction mixture is fluid, pouring it into molds to cool and solidify.
Claim 11
Dependent Claim
138 words
A process for preparing homogeneous fused blocks of a storage-stable detergent composition comprised of, on a weight basis of said composition, from about 2 to about 70% by weight of sodium hydroxide, from about 2 to about 60% by weight of sodium silicate, from about 10 to about 40% by weight of water, from about 2 to about 50% by weight of pentasodium triphosphate, and from about 0.2 to about 4% by weight of an active chlorine donor having a hydrolysis constant of about 3×10 -4 or below, which comprises heating said sodium silicate with said sodium hydroxide to a temperature between about 45 and about 65° C., adding the remaining ingredients at a temperature of between about 50 and about 65° C., and while the reaction mixture is fluid, pouring it into molds to cool and solidify.
Claim 12
Dependent Claim
102 words
The process of claim 8 wherein the detergent composition comprises on a weight basis from about 2 to about 70% sodium hydroxide; a silicate selected from the group consisting of sodium metasilicate and waterglass solution wherein the amount of metasilicate is from about 2 to about 60% and the amount of waterglass is from about 2 to about 30%; from about 0.2 to about 4% of an active chlorine donor having a hydrolysis constant of about 3×10 -4 or below; from about 2 to about 50% on an anhydrous basis of pentasodium triphosphate, and from about 10 to about 40% of water.
Claim 13
Dependent Claim
22 words
The process of claim 9 wherein the remaining ingredients are added at a temperature of from about 55 to about 63° C.
Claim 14
Dependent Claim
15 words
The process of claim 10 wherein the chlorine donor is sodium N-chloro-p-toluene sulfonic acid amide.
Claim 15
Dependent Claim
11 words
The process of claim 10 wherein the chlorine donor is Na-monochloroamidosulfonate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |